<template>
    <div class="cmt-container">
        <h3>发表评论</h3>
        <hr>

        <textarea placeholder="请输入要评论的内容（最多120字）" maxlength="120" v-model="msg">

        </textarea>
        <mt-button type="primary" size="large" @click="postComment">发表评论</mt-button>
        <div class="cmt-list" v-for="(item, index) in comments" :key="item.add_time">
            <div class="cmt-item">
                <div class="cmt-title">
                    第{{index+1}}楼&nbsp;&nbsp;用户：{{item.user_name}}&nbsp;&nbsp;
                    发表时间：{{item.add_time|dateFormat}}
                </div>
                <div class="cmt-body">
                    {{item.content==='undefined'? "此用户很懒，啥都没说":item.content}}
                </div>
            </div>
        </div>
        <mt-button type="danger" size="large" plain @click="getMore">加载更多</mt-button>
    </div>
</template>

<script>
import { Toast } from 'mint-ui';

export default {
  data() {
    return {
      pageIndex: 1, // 默认展示评论第一页数据
      comments: [],
      msg: '',
    };
  },
  props: ['id'],
  created() {
    this.getComments();
  },
  methods: {
    getComments() {
      this.$http.get(`api/getcomments/${this.id}?pageindex=${this.pageIndex}`).then((res) => {
        const result = res.body;
        if (result.status === 0) {
          this.comments = this.comments.concat(result.message);
        } else {
          Toast('获取评论数据失败……');
        }
      });
    },
    getMore() {
      this.pageIndex = this.pageIndex + 1;
      this.getComments();
    },
    postComment() {
      if (this.msg.trim().length === 0) {
        Toast('评论内容不能为空！');
        return;
      }
      this.$http.post(`api/postcomment/${this.$route.params.id}`, { content: this.msg.trim() }).then((res) => {
        const result = res.body;
        if (result.status === 0) {
          const cmt = { user_name: '匿名用户', add_time: Date.now(), content: this.msg };
          this.comments.unshift(cmt);
          this.msg = '';
        } else {
          Toast('上次评论失败……');
        }
      });
    },
  },
};
</script>

<style lang="scss" scoped>
.cmt-container{
    h3{
        font-size: 18px;
    }
    textarea{
        font-size:14px;
        height: 85px;
        margin: 0;
    }
    .cmt-list{
        margin: 5px 0;
        .cmt-item{
            font-size: 13px;
            .cmt-title{
                line-height: 30px;
                background-color: #ccc;
            }
            .cmt-body{
                line-height: 35px;
                text-indent: 2em;
            }
        }
    }
}
</style>

